Construction of Community Hall at Chhani TP 13 FP52, Vadodara

Name of Work: Supply, Installation, Testing &

Commissioning of Electrification work & Solar

Rooftop Work for Newly Constructed

Community Hall, TP 13 , Chani, Vadodara

Municipal Corporation, Vadodara (%Rate

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

SPECIFICATIONS FOR ELECTRICAL WORKS

SR.NO PARTICULARS

1 General Instructions for Electrical Works

2 Technical Specification for LT Panels.

3 Technical Specification for LDBs & PDBs.

4 Technical Specification for LT Cables & Cable Tray.

5 Technical Specification for Internal Wiring.

6 Technical Specification for Lighting Fixtures.

7 Technical Specification for Data, TV & Telephone wiring.

8 Technical Specification for Earthing System.

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

1 GENERAL INSTRUCTIONS FOR ELECTRICAL WORKS

The scope of this section is to describe materials and systems for electrical installation works

which form together with the project documents, a complete volume of work and quality

All electrical installations shall be of high quality, safe, complete and fully operational including

all necessary items and accessories whether or not specified in details. All electrical works shall

be completed in accordance with the regulations and standards as per the statutory

requirement to the satisfaction of the Employer. The general provisions, special provisions and

general requirements apply to all items of this specification.

The work shall be carried out simultaneously with building work, civil work, etc. and shall be

continued till it is completed satisfactorily along with the completion of essential portions of

the building works.

During the progress of work, completed portion of the building may be occupied and be put to

use by Employer but the contractor will remain fully responsible for the maintenance of

electrical installations till the entire work covered by this contract is satisfactorily completed

by him and handed over to Employer.

It is the intention of the specification and drawings to call for finished work, tested and ready

for operation. Whenever the words “Supply” or “Provide” are used, it shall mean delivery of

material as specified in an assembled manner, ready for installation. Any apparatus, material or

work not shown on drawings but mentioned in the specification or vice versa, or any incidental

accessories necessary to make the work complete and perfect in all respects and ready for

operation, even if not particularly specified, shall be furnished, delivered and installed by the

contractor without additional expenses to Employer. Minor details not usually shown or

specified, but necessary for the proper installation and operation, shall be included in the work

and in the contract.

Electrical contractor shall be Class A licensed Contractor registered with R&B Department of

Gujarat and shall have completion certificate of three similar project Electrical jobs completed

of same cost in last 3 years.

Civil Contractor shall provide the MOU signed with Electrical contractor (Class A) with

Technical bid during bidding process.

2) INTERPRETATION OF PROJECT DOCUMENTS :

The Specification, Drawings and Bill of quantity shall be interpreted in accordance with good

installation practice defined in the appropriate regulations and standards whether specifically

referred to or not. If there are any discrepancies or shortfall in the application of the

regulations to any aspect of this contract or the contractor considers there is anything

detrimental to the standards or inconsistent with his obligations and guarantees, Employer

shall be informed prior to signing the contract and thereafter inform the contractor in writing

the course to be followed. Where the drawings are to a small scale or are expressed in symbolic

terms or are in the form of a diagram, then exact location of items shall not be inferred and in

all cases, the work shall be fully integrated with the work of other traders and with the fabric of

the building. The contractor shall appraise the duties of all plants and equipments taking

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

account of any additions or variations and shall inform the Employer of any matters which may

affect the design. In all cases the equipment in stalled shall be of appropriate rating for the duty

The Specifications and bill of quantity shall be considered as part of this contract and any work

or material shown on BOQ and not called for in the specification or vice versa, shall be executed

as if specifically called for in both. The drawings indicate the extent and general arrangement of

the Transformer, L.T. panel, H.T. & L.T. cable route layout etc. and are essentially diagrammatic.

The work shall be installed as indicated on the drawings, however, any minor changes found

essential to co-ordinate the installations of this work with other services shall be made without

any additional cost to the Employer. The drawings are for the guidance of the contractor, exact

locations, distances and levels will be governed by the building. The contractor shall examine

all structural and electrical drawings before starting the work, and report to Employer or its

representative, any discrepancies, which in his opinion appear on them, and get them clarified.

If any discrepancy is noticed between General Conditions of Contract, specification, Bill of

quantity and Drawings, the most stringent of the above shall apply. Bill of quantities, for

electrical items, shall be read in conjunction with respective specification. However, in case of

conflict between bill of quantities and the specification, former shall govern.

3) SYSTEM PARTICULARS :

LV : 433 V, 3 Phase, 4 wire, 50 Hz.

Neutral earthing : Solid

4) ABBREVIATIONS :

The following abbreviations have been used in the accompanying specifications, drawings and

bill of quantity.

IS : Indian Standard British

HRC : High Rupturing

GI : Capacity Galvanised

CU : Iron Copper

MS : Mild Steel

MV : Medium Voltage

LV : Low Voltage

PVC : Polyvinyl Chloride

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

KV HV : Kilo Volts

KW : High Voltage

KVA : Kilo Watt

PF Hz : Kilo Volt Ampere

KWH : Power Factor

XLPE : Frequency

ACB : Kilo Watt Hour

LED : Cross Linked Polyethylene

PLC : Air Circuit Breaker

UPS : Light Emitting Diode

DP : Programmable Logic Controller

IEE : Uninterrupted Power Supply

MCB : Double Pole

TPN : Institute of Electrical Engineers, London

SP : Miniature Circuit Breaker

MCCB : Triple Pole and Neutral

VCB : Single Pole

CT DB : Moulded Case Circuit Breaker

DG : Vacuum Circuit Breaker

BOQ : Current Transformer

SITC : Distribution Board

L.O.I. : Diesel Generator

ELV : Bill of quantity

MP : Supply, Installation, Testing and Commissioning

: Letter of Intent / Acceptance letter

: Extra Low Voltage System

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

CCTV : Close Circuit Television Public

PA : Address System Fire Alarm Control

NVR : Network Video Recorder

NVMS : Network Video Monitoring Software

5) REGULATIONS AND STANDARDS :

The installation shall conform in all respects to Indian Standard Code of Practice for Electrical

Wiring Installation IS: 732-1983 and IS: 2214 – 1983 (Silver Nitrate Pure and analytical

reagent). It shall also be in conformity with the current Indian Electricity, Rules, Indian

Electricity Act, National Electrical Code and Regulations of the Local Electrical Supply Authority

in so far as these become applicable to the installation. Wherever this specification calls for a

higher standard of material and/or workmanship than those required by any of the above

regulations then this specification shall take precedence over the said regulations and

standard. In general, the materials equipment and workmanship not covered by the above shall

conform to the relevant Indian Standards.

The electrical installation work shall follow Codes, Indian Standard specifications and rules

(Within the best meaning of the same) under this contract.

The following list is given for general guidance only in addition to list given in each individual

section, however all other latest editions of Codes, Indian Standard specifications and Rules

shall also be followed when it is required.

IS: 8623 Low voltage switchgear & control gear assemblies

IS: 10118 Code of Practice for selection, installation and maintenance

Of switchgear and control gear

General requirement for switch gear and control gear for

Voltage not exceeding 1000 Volt A.C. or 1200 Volt D.C.

Low voltage switchgear and control gear

Low voltage fuses

Circuit breakers for out protection for household and

IS: 8828 Similar installations

Earth leakage circuit breaker

IS: 12640 direct acting indicating analog electrical measuring

Current transformers

IS: 2705 Application guide for voltage transformers

IS: 4201 Control switches for voltage up to and indicating 1000 V

A.C. and 1200 V D.C.

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

IS: 5578 Guide for marking of insulated conductors

IS: 11353 Guide for uniform system of marking and identification of

Conductors and apparatus transmission

Terminal markings for electrical measuring instruments

And their accessories

Specifications for PVC insulated cables for working

IS: 694 Voltage up to and including 1100 volts

Danger notice plates

IS: 2551 Code of practice for earthing

IS: 3043 Guide for safety procedures and practices in electrical work

IS: 5216 Code of practice for fire safety of building: Electrical

IS: 1646 Installation

Indian Electricity Act as amended up to date

Indian Electricity Rules as amended up to date

Rules and Regulations of Bombay Regional Council of Fire Insurance & Association of

India for Electrical wiring.

6) FEES, PERMITS AND TESTS :

The Contractors shall pay for any and all fees and obtain permits required for the installation

work. On completion of the work, the contractor shall obtain and deliver to the Employer,

certificates of final inspection and approval by the local electric supply authority and the

Electrical Inspector.

7) ACTUAL ROUTE OF CABLE :

The location of the cables, panel boards etc. is only indicative, therefore, the actual route of

cables and the location of panel boards may differ from the plans according to the details of the

building construction and the conditions of executions of the installations.

The contractor shall supply and install at his expense all secondary materials and special

fittings found necessary to overcome the interference and to supply the modifications on the

route of cables and conduits that are found necessary during the work, to the complete

satisfaction of the Employer’s representative.

8) MATERIAL AND EQUIPMENT :

All material and equipment shall conform to the relevant standards and shall be new, good

quality, of the approved make and design. The materials and equipment shall confirm to

relevant Indian Standards. The Contractor shall be responsible for the safe custody of all

materials and shall insure them against theft, damage by fire, earthquake etc. A list of items of

materials and equipment, together with sample of each shall be submitted to the Employer

within 10 days of the award of the contract. Any item which is proposed as a substitute, shall be

accompanied by all technical details giving sizes, particular of materials and the manufacturer’s

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

name and shall be submitted along with the tender or bid offer. At the time of the submission of

proposed substitute the Contractor shall state the credit, if any due to the Employer. In the

event the substitution is approved, all changes and substitutions shall be requested in writing

and approvals obtained in writing from Employer. Employer’s decision in the matter shall be

All materials of the same kind of service shall be identical and made by the same

manufacturers. Any deviation to this rule shall be approved by the Consultant. Top priority

shall be given to the products that have a permanent agent providing spare parts and

maintenance facilities in the same city where the project is situated.

The makes of electrical equipments, components, accessories etc. have been mentioned in

Tender document. However, Client / Electrical Consultant reserves the right to select from the

specified make. Contractor shall clearly indicate in the bid document, the make they have

considered. No extra claim shall be applicable if client / consultant suggests from the

alternative make specified in the tender document.

9) MANUFACTURERS :

Where manufacturers have furnished specific instructions relating to the materials used in this

job, covering points not specifically mentioned in these documents, these instructions shall be

followed in all cases.

Where manufacturer’s names and/or catalogue numbers are given, this is an indication of the

quality, standards and performance required.

When interfacing occurs, equipment shall be mutually compatible in all respects.

Rating of all items shall be appropriate for the conditions on the particular site on which the

items will be used. All the equipment shall be fit for continuous work under the worst

conditions of site and shall be rated for the following ambient condition.

Outdoor temperature 50 deg.c.

Temperature under shed 45 deg.c.

Salty, dusty and humid

11)INSPECTION AND TESTING :

Employer’s representative reserves the right to request inspection and testing at

manufacturer’s works at all reasonable times for this contract. Tests on site of completed

works shall demonstrate, among other things:

1. That the equipment installed complies with specification in all particulars and is of the

correct rating for the duty and site conditions.

2. That all items operate efficiently and quietly to meet the specified requirements.

3. That all circuits are correctly fused and protected and that protective devices are

properly co-ordinated.

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

4. That all non current carrying metal work is properly and safely grounded in accordance

with the specifications.

5. The contractor shall provide all necessary instruments and labour for testing, shall make

adequate records of test procedures and readings, shall repeat any tests requested by

the Employer and shall provide test certificates signed by a properly authorised person.

Such test certificates shall cover all works.

6. If tests fail to demonstrate the satisfactory nature of the installation or any part thereof

then no claims for the extra cost of modifications, replacements or re-testing will be

considered. Employer’s decision as to what constitutes a satisfactory test shall be final.

7. The above general requirements as to testing shall be read in conjunction with any

particular requirements specified elsewhere.

12) TEST CERTIFICATES :

The contractor shall submit test certificates for all the electrical material / system installed.

These shall be issued by a government recognized inspection office certifying that all

equipment, materials, construction and functions are in agreement with the requirements of

these specifications, ISI and when ISI is not applicable other approved certifying agencies.

13) INSTRUCTION MANUAL :

The contractor shall prepare and produce instruction, operation and maintenance manuals in

English for the use, operation and maintenance of the supplied equipment and installations,

and submit 3 sets to Employer, at the time of handing over.

14) SAMPLES AND CATALOGUES :

Before ordering the material necessary for these installations, the contractor shall submit to

Employer for approval, a sample of every kind of material such as cables, conductors, conduits,

switches, socket outlets, circuit breakers, lighting fixtures, boxes etc. along with the catalogues.

For big items such as switchboards, the submission of catalogues shall be enough. Prior to

ordering any electrical equipment / material / system, the contractor shall submit to Employer,

the catalogues, along with the samples, at least from three different manufacturers. After the

selection of manufacturer by Employer, the contractor shall arrange inspection and testing at

the manufacturer’s factory or assembly shop for final approval. No material shall be procured

prior to the approval of the Electrical consultant & Data sheets shall be signed and stamped by

consultant and one copy to be submitted to Client.

15) VENDOR AND SHOP DRAWINGS :

The contractor shall prepare and submit to Employer, for his approval, two sets of vendor

detailed drawings of all distribution boards, switch boards, outlet boxes, special pull boxes and

other likewise material, equipment to be fabricated by the contractor, or other vendor within

15 days of signing of the contract.

Before starting the work, the contractor shall submit to Employer for his approval in the

prescribed manner, the shop / execution drawings for the entire installation, specially the main

connections and junctions, the route of conduits and cables, no. and size of wires drawn

through the conduits, location of all the outlet points, and switch boards and distribution

boards and any other information required by Employer. Employer reserves the right to alter

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

or modify these drawings if they are found to be insufficient or not complying with the

established technical standards or if they do not offer the most satisfactory performance or

accessibility for maintenance.

16) AS BUILT DRAWINGS :

At the completion of work and before issuance of certificate of virtual completion the

contractor shall submit to Employer, three sets of layout drawing drawn at appropriate scale

indicating the complete wiring system “as installed”. These drawings must provide (in plan,

folded elevation and section)

a. Location and details of distribution boards, main switches, switchgear and other

Location of all earthing stations, route and size of all earthing conductors,

b. manholes etc.

Route and particulars of all cables.

Lighting layout plans with conduit routing layout/cable tray for all the floors

d. along with circuit distribution details.

External Area Lighting Plan

17) GUARANTEE :

At the close of the work and before issuance of final certificate of virtual completion by

Employer, the contractor shall furnish written guarantee indemnifying Employer against

defective materials and workmanship for a period of one year after completion. The contractor

shall hold himself fully responsible for reinstallation or replacement, free of cost to Employer,

a. Any defective work or material supplied by the contractor.

b. Any material or equipment supplied by Employer, which is damaged or destroyed as a

result of defective workmanship by the contractor.

c. Any material or equipment damaged or destroyed as a result of defective workmanship

by the contractor.

18) SPECIAL NOTES FOR BIDDER :

a. All the major electrical components like Transformers, DGs, HT MV LT switchgears, DBs,

UPS, etc including the external & internal electrical distribution system, earthing

systems & various equipments (which is supplied &/or installed by the contractor) shall

be maintain for 2 years from the date of virtual completion of work at free of cost.

b. The contractor should co-operate & coordinate for LT connections to LT panel board of

various blocks, so that day to day work should not suffer.

c. It is in the scope of Contractor to preparing necessary drawing submitting to authorities

(i.e. Local supply co., pollution control board, Electrical Inspector, etc), getting their

approval / sanction and final certificate to energize the sub-station equipment’s. Filling

the necessary application to supply co. following up and getting the supply filling the

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

necessary test report to the supply co. inclusive. All official / statutory fees shall be paid

by clients & all other required expenses shall be on the contractors account; no extra

payment shall be paid to contractor for said job.

d. LT Panels shall be approved on site by Engineer in Charge & Electrical Consultant.

e. Contractor shall submit Shop drawings for approval to Electrical consultant based on

tender drawings before execution which shall not be on chargeable basis.

f. The MCB and MCB DBs must be of same make.

g. Make of components required to be used by contractor to complete the installation, if

by not mentioned anywhere, shall be required to GOT IT APPROVED

Client/Architect/Consultant before installation in writing manner.

h. Within a week of work order, the contractor shall submit the sample of each item /

component of above mentioned approved make for the approval of the

Client/Architect/Consultant.

2 TECHNICAL SPECIFICATION FOR LT PANELS

1) SCOPE OF WORK

1. Main Distribution Panels, Sub-Distribution Panels and Final Distribution shall be covered under

3 Phtahsise/sseicntgiolen.pPhaans el, s/Boards shall be suitable for operation on

415/240 volts, 50 cycles, 4 wire system with neutral grounded at transformer. All Distribution

panels shall be CPRI tested design and manufactured by an approved manufacturer. CPRI

certificate shall be made available.

2. Distribution panels shall comply with the latest Relevant Indian Standards and Electricity Rules

and Regulations and shall be as per IS-13947-1991.

2) CONSTRUCTION FEATURES:

1. Distribution panels shall be 2 mm thick sheet steel cabinet for indoor installation, dead front,

floor mounting/wall mounting type and shall be form as per site construction requirements.

2. The Distribution panels shall be totally enclosed, completely dust and vermin proof and shall

be with hinged doors and folded covers, Neoprene gasket, padlocking arrangement and bolted

3. All removable/ hinged doors and covers shall be grounded by flexible standard connectors.

4. Distribution panel shall be suitable for the climatic conditions as specified in Special

Conditions. Steel sheets used in the construction of Distribution panels shall be 2 mm thick and

shall be folded and braced as necessary to provide a rigid support for all components.

5. Joints of any kind in sheet metal shall be seam welded, all welding, slag shall be rounded off and

welding pits wiped smooth with plumber metal.

6. The general construction shall confirm to IS-8623-1977 (Part-1) for factory built assembled

switchgear & control gear for voltage up to and including 1100 V AC.

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

7. All panels and covers shall be properly fitted and square with the frame, and holes in the panel

correctly positioned.

8. Fixing screws shall enter into holes tapped into an adequate thickness of metal or provided

with wing nuts.

9. Self threading screws shall not be used in the construction of Distribution panels.

10. A base channel of 75 mm x 40 mm x 5 mm thick shall be provided at the bottom for floor

mounted panels.

11. Minimum operating clearance of 300 mm shall be provided between the floor of Distribution

panels and the lowest feeder compartment.

12. Distribution panels shall be of adequate size with a provision of spare switchgear as indicated

on the Single Line Diagram. Feeders shall be arranged in multi-tier.

13. Knockout holes of appropriate size and number shall be provided in the Distribution panels in

conformity with the location of cable/conduit connections.

14. Removable sheet steel plates shall be provided at the top to make holes for additional cable

entry at site if required.

15. Every cabinet shall be provided with Trifoliate or engraved metal name plates.

16. All panels shall be provided with circuit diagram engraved on PVC sheet.

17. All live accessible connections shall be shrouded and shall be finger touch proof and minimum

clearance between phase and earth shall be 20 mm and phase to phase shall be 25 mm.

3) BUSBAR CONNECTIONS:

1. Bus bar and interconnections shall be of high conductivity electrolytic grade aluminium /

copper as indicated in the bill of quantities complying with requirement of IS : 5082 –

and of rectangular cross section suitable for carrying the rated full load current and short

circuit current and shall be extendable on either side.

2. Bus bars and interconnections shall be insulated with heat shrinkable sleeve of 1.1 KV grade

and shall be colour coded.

3. Bus bars shall be supported on glass fiber reinforced thermosetting plastic insulated supports

at regular intervals to withstand the force arising from in case of short circuit in the system.

4. All bus bars shall be provided in a separate chamber and all connections shall be done by

5. Additional cross sectional area to be added to the bus bar to compensate for the holes.

6. All connections between bus bars and breakers shall be through solid copper / aluminium

strips of proper size to carry full rated current and insulated with insulating sleeves.

7. Maximum current density for the bus bars shall be 0.8-1A/sq.mm for aluminium and

A/sq.mm for copper bus bars.

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

8. The busbar shall be housed in a separate compartment. The busbar shall be isolated with

mm. thick bakelite sheet to avoid any accidental contact. The busbar shall be arranged such

that minimum clearance between the busbar are maintained as below :

Between phases : 25 mm. minimum

Between phases and neutral : 25 mm.

Between phases and earth : 25 mm.

Between neutral and earth : 20 mm. minimum

Maximum allowable temperature for the Bus bar to be restricted to 85 deg C

4) TEMPERATURE – RISE LIMIT

1. Unless otherwise specified, in the case of external surface of enclosures of bus bar

compartment which shall be accessible but do not need to be touched during normal operation,

an increase in the temperature rise limits of 25° C above ambient temperature shall be

permissible for metal surface and of 15° C above ambient temperature for insulating surfaces

as per IS 8623(Part-2)

2. All main distribution panels and sub distribution panels shall be provided with MCCB of

appropriate capacity as per Single Line Diagram.

3. All final Distribution boards shall be provided with Miniature Circuit Breakers.

4. Final Single Phase Distribution boards shall be connected to the incoming supply through

double pole MCB units & earth leakage circuit breakers.

5. All wiring for final distribution boards shall be concealed behind 5 mm thick bakelite sheet or

M S sheet cover.

6. All Distribution boards shall be completely factory wired, ready for connection.

7. All the terminals shall be of proper current rating and sized to suit individual feeder

8. Each circuit shall be clearly numbered from left to right to correspond with wiring diagram.

9. All the switches and circuits shall be distinctly marked with a small description of the service

10. Continuous earth bus sized for prospective fault current shall be provided with arrangement

for connecting to station earth at two points. Hinged doors/ frames shall be connected to earth

through adequately sized flexible braids.

5) CABLE COMPARTMENTS

1. Cable compartment of adequate size shall be provided in the Distribution panels for easy

clamping of all incoming and outgoing cables entering from the top/bottom. Adequate

supports shall be provided in cable compartment to support cables.

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

6.1 MOULDED CASE CIRCUIT BREAKER (MCCB)

6.1.1 The MCCB should be current limiting type with trip time of less than 10 msec under short

circuit conditions. The MCCB should be either 3 or 4 poles as specified in BOQ. MCCB shall

comply with the requirements of the relevant standards IS13947 – Part 2/IEC 60947-2 and

should have test certificates for Breaking capacities from independent test authorities CPRI

/ ERDA or any accredited international lab.

6.1.2 MCCB shall comprise of Quick Make -break switching mechanism, arc extinguishing device

and the tripping unit shall be contained in a compact, high strength, heat resistant, flame

retardant, insulating moulded case with high withstand capability against thermal and

mechanical stresses

6.1.3 The breaking capacity of MCCB shall be as specified in the schedule of quantities.

6.1.4 The rated service breaking capacity (Ics) should be equal to rated ultimate breaking

capacities (ICU).

MCCBs for motor application should be selected in line with Type-2 Co-ordination as per

The breaker as supplied with ROM should meet IP54 degree of protection.

6.2 CURRENT LIMITING & COORDINATION

6.2.1 The MCCB shall employ maintenance free minimum let-through energies and capable of

achieving discrimination up to the full short circuit capacity of the downstream MCCB. The

manufacturer shall provide both the discrimination tables and let-through energy curves

Protection Functions

6.2.2 MCCBs with ratings up to 200 A shall be equipped with Thermal-magnetic (thermal for

overload and magnetic for short-circuit protection) trip units (as per Single line diagram).

Microprocessor MCCBs with ratings 250A and above shall be equipped with

microprocessor based trip units (as per Single line diagram).

Microprocessor and thermal-magnetic trip units shall be adjustable and it shall be possible

6.2.4 to fit lead seals to prevent unauthorised access to the settings

Microprocessor trip units shall comply with appendix F of IEC 60947-2 standard

6.2.5 (measurement of rms current values, electromagnetic compatibility, etc.)

Protection settings shall apply to all poles of circuit breaker.

6.2.6 All Microprocessor components shall withstand temperatures up to 125 °C.

6.2.7 Rotary handles to be provided for operation where ever required as indicated in Single line

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

6.3.1 Original test certificate of the MCCB as per IEC 60947-1 &2 or IS13947 shall be furnished.

Pre-commissioning tests on the switch board panel incorporating the MCCB shall be done

as per standard specifications.

6.4 INTERLOCKING

6.4.1 Moulded, case circuit breakers shall be provided with the following interlocking devices for

interlocking the door of a switch board.

o Handle interlock to prevent unnecessary manipulations of the breaker.

o Door interlock to prevent the door being opened when the breaker is in ON

Defeat-interlocking device to open the door even if the breaker is in ON position.

o PLC controller to operate the Motorized Breakers in sequence as indicated logic

diagram in SLD.

6.4.2 The MCCB shall be current limiting type and comprise of quick make – Break switching

mechanism. MCCBs shall be capable of defined variable overload adjustment. All MCCBs

rated 200 Amps and above shall have adjustable over load & short circuit pick-up both in

Thermal magnetic and Microprocessor Trip Units.

6.4.3 All MCCB with microprocessor based release unit, the protection shall be adjustable

Overload, Short circuit and earth fault protection with time delay.

The tripcommand shall override all other commands.

6.5 MINIATURE CIRCUIT BREAKER (MCB)

6.5.1 Miniature Circuit Breaker shall comply with IS-8828-1996/IEC898-1995. Miniature circuit

breakers shall be quick make and break type for 240/415 VAC 50 Hz application with

magnetic thermal release for over current and short circuit protection.

6.5.2 The breaking capacity shall not be less than 10 KA at 415 VAC. MCBs shall be DIN mounted.

The MCB shall be Current Limiting type (Class-3). MCBs shall be classified (B, C, D ref IS

standard) as per their Tripping Characteristic curves defined by the manufacturer.

6.5.3 The MCB shall have the minimum power loss (Watts) per pole defined as per the IS/IEC

and the manufacturer shall publish the values.MCB shall ensure complete electrical

isolation & downstream circuit or equipment when the MCB is switched OFF.

6.5.4 The housing shall be heat resistant and having high impact strength. The terminals shall be

protected against finger contact to IP20 Degree of protection. All DP, TP, TPN and 4 Pole

miniature circuit breakers shall have a common trip bar independent to the external

operating handle.

6.6 RESIDUAL CURRENT CIRCUIT BREAKER CURRENT OPERATED TYPE (RCCB)

System of Operation

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

6.6.1 Residual Current Circuit Breaker shall confirm to IEC 61008.RCCB shall work on the

principle of core balance transformer.

6.6.2 The incoming shall pass through the torroidal core transformer. As long as the currents in

the phase and neutral shall be the same, no electro motive force shall be generated in

the secondary winding of the transformer.

6.6.3 In the event of a leakage to earth, an unbalance shall be created which shall cause a

current to be generated in the secondary winding, this current shall be fed to a highly

sensitive miniature relay, which shall trip the circuit if the earth leakage current exceeds

a predetermined critical value. RCCB shall be current operated independent of the line

voltage, current sensitivity shall be of 30 mA at 240/415 volts AC and shall have a

minimum of 20,000 electrical operations.

Mechanical Operation

6.6.4 The moving contacts of the phases shall be mounted on a common bridge, actuated by a

rugged toggle mechanism. Hence, the closing /opening of all the three phases shall occur

simultaneously. This also shall ensure simultaneous opening of all the contacts under

tripping conditions.

Neutral Advance Feature

6.6.5 The neutral moving contact shall be so mounted on the common bridge that, at the time of

closing, the neutral shall make contact first before the phases; and at the time of opening,

the neutral shall breaks last after allowing the phases to open first. This is an important

safety feature which is also required by regulations.

Testing Provision

6.6.6 eAatretsht ldeeavkiacgeesdheatlel cbteioincorporated to check the integrity of the

system and the tripping mechanism. When the unit is connected to service, pressing the

test knob shall trip the ELCB / RCCB and the operating handle shall move to the "OFF"

4) ELECTRICAL POWER AND CONTROL WIRING CONNECTION : Terminal for both incoming

1. and outgoing cable connections shall be suitable for 1100 V grade,

aluminium / copper conductor PVC insulated and sheathed, armoured cable and shall be

suitable for connections of solderless sockets for the cable size as indicated on the appended

drawings for the Panels.

Power connections for incoming feeders of the main Panels shall be suitable for 11000 V

3. aluminium conductor (XLPE) cables.

Both control and power wiring shall be brought out in cable alley for ease of external

connections, operation and maintenance.

Both control and power terminals shall be properly shrouded.

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

5.10% spare terminals shall be provided on each terminal block. Sufficient terminals shall be

provided on each terminal block, so that not more than one outgoing wire is connected to per

6T .erminal strips for power and control shall preferably be separated from each other by

suitable barriers of enclosures.

7.Wiring inside the modules for power, control, protection and instruments etc. shall be done

with use of 660 / 1100 V grade, PVC insulated copper conductor cables conforming to IS :

and IS : 8130. Power wiring inside the starter module shall be rated for full current raring of

respective contactor, but not less than 4.0 sq.mm. Cross-section area. For current transformer

circuits, 2.5 sq.mm. Copper conductor wire shall be used. Other control wiring shall be done

with 1.5 sq.mm. Copper conductor wires. Wires for connections to the door shall be flexible. All

conductors shall be crimped with solderless sockets at the ends before connections are made

to the terminals. All wires shall be FRLS grade.

Control power for the Motor starter module shall be taken from the respective module

switchgear outgoing. Control power wiring shall have control fuses, (HRC fuse type) for circuit

protection. All indicating lamps shall be protected by HRC fuses.

Particular care shall be taken to ensure that the layout of wiring is neat and orderly.

Identification ferrules shall be filled to all the wire termination for ease of identification and to

facilitate checking and testing.

10. “CUPAL” washers shall be used for all copper and aluminium connections.

11. Final wiring diagram of the Panels power and control circuit with ferrules numbers shall be

submitted alongwith the Panels as one of the documents against the contracts.

1. The outgoing terminals and neutral link shall be brought out to a cable alley suitably located

and accessible from the panel front. The current transformers for instruments metering shall

be mounted on the disconnecting type terminal blocks. No direct connection of incoming or

outgoing cables to internal components of the distribution board is permitted, only one

conductor may be connected in one terminal.

1. A horizontal PVC wire way with screwed covers shall be provided at the top to take

interconnecting control wiring between different vertical sections.

1. Engraved PVC labels shall be provided on all incoming and outgoing feeders. Single line circuit

diagram showing the arrangements of circuit inside the distribution board shall be pasted on

inside of the panel door and covered with transparent laminated plastic sheet.

8) NAME PLATE :

1. A name plate with the Panels designation in bold letters shall be fixed at top of the central

panel. A separate name plate giving feeder details shall be provided for each feeder module

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

I2n. side the feeder compartments, the electrical components, equipments, accessories like

switchgear, control gear, lamps, relays etc. shall suitably be identified by providing stickers.

3.Engraved name plates shall preferably be of 3 ply, (Red-White-Red or Black-White-Black)

lamicold sheet. However, black engraved perpex sheet name plates shall also be acceptable.

Engraving shall be done with square groove cutters.

4N. a m e plate shall be fastened by counter sund screws and not by adhesives.

9) DANGER NOTICE PLATES :

1. The danger notice plate shall be affixed in a permanent manner on operating side of the Panels.

2. The danger notice plate shall indicate danger notice both in Hindi and English and with a sign

of skull and bones.

The danger notice plate, in general, meet the requirements of local inspecting authorities.

Overall dimensions of the danger notice plate shall be 200 mm. wide x 150 mm. high.

The danger notice plate shall be made from minimum 1.6 mm. thick mild steel sheet and after

5. due pre-treatment to the plate, the same shall be painted white with vitreous enamel paint on

both front and rear surface of the plate.

The letters, the figures, the conventional skull and bones etc. shall be positioned on plate as per

6. recommendation of IS: 2551-1982.

The said letters, the figures and the sign of skull and bones shall be painted in signal red colour

7. as per IS: 5-1978.

The danger plate shall have rounded corners. Location of fixing holes for the plate shall be

8. decided to suit design of the Panels.

The danger notice plate, if possible, be of ISI certification mark.

1. Earthing shall be provided as per IS: 3043-1987.

12. All sheet steel work shall undergo a process of degreasing, pickling in acid, cold rinsing,

phosphating, passivaiting (seven tank processing) and then painted with electrostatic paint

(Powder coating).

13. The shade of colour of panel inside/outside shall be as per BOQ confirming to IS Code No.5.

1. Engraved PVC labels shall be provided on all incoming and outgoing feeder.

2. Circuit diagram showing the arrangements of the circuit inside the distribution panels shall be

pasted on inside of the panel door and covered with transparent plastic sheet.

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

1. All voltmeters and indicating lamps shall be through MCB’s.

2. Meters and indicating instruments shall be flush type.

3. All CT’s connection for meters shall be through Test Terminal Block (TTB).

4. CT ratio and burdens shall be as specified on the Single line diagram/BOQ.

14) CURRENT TRANSFORMERS

1. Current transformers shall be provided for Distribution panels carrying current in excess of

All phase shall be provided with current transformers of suitable VA burden with 5 amps

2. secondaries for operation of associated metering.

The CTs shall confirm to relevant Indian Standards. The design and construction shall be dry

3. type, epoxy resin cast robust to withstand thermal and dynamic stresses during short circuits.

Secondary terminals of CTs shall be brought out suitable to a terminal block which shall be

4. easily accessible for testing and terminal connections.

The protection CTs shall be of accuracy class 5P10 and measurement CTs shall be of accuracy

15) POTENTAIL FREE CONTACTS

1. Potential free contacts shall be provided for connection to Building Automation System in

panels indicated in Schedule of Quantities.

16) INDICATING PANEL

1. All meters and indicating instruments shall be in accordance with relevant Indian Standards.

Meters shall be flush mounted type. Indicating lamps shall be of low burden, and shall be

backed up with 2 amps MCB/MPCB as per relevant fault level and toggle switch.

1. Testing of panels shall be as per following codes:

I. IS: 8623 (Part -I) 1977 for factory built assemblies of switch gear for voltages

upto and including 1000 VAC.

II. IS: 13947 : 1993 Degree of protection

III. IS: 5578 & 11353:1985 Arrangement of bus bars.

1. In wiring a distribution panel it shall be insured that total load of various distribution panel

and/or consuming devices is divided evenly between the phases and number of ways as per

Consultants drawing.

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

19) INSTALLATION

1. Installation of all LT panels shall include but not limited to the following to complete the

installation, testing and commissioning:

Transporting materials from stores to exact location of installation.

Supply and installation of required base frame made of MS angle or channel sections and duly

3. painted with black paint.

Positioning, aligning, fixing, assembling, and installation of LT panel issued free of cost by Client

4. after carrying out proper cleaning and inspection.

Site supervision, testing for proper functioning / operation, and pre-commissioning tests.

20) COMMISIONING & ONSITE TESTING

1. All switchboards shall be tested for dielectric test with 1000V megger.

2. All earth connections shall be checked for continuity.

3. All busbar connections shall be checked and tightened properly.

4. All cable terminations and terminal shrouding shall be checked if they are properly done.

5. The operation of protective devices shall be tested by secondary injection test.

6. The operation of circuit breaker shall be tested for all interlocks.

7. Functional test shall be done for all ACBs, MCCBs and other components.

8. Indicating lamps and meters shall be checked for proper working.

21) WORKMANSHIP:

1. The contractor shall erect the panel at site in co-ordination with the supplier if required.

2. He should check for loose ends on the part of the supplier and shall inform client and

consultant for the same.

Physical and continuity tests shall be carried out by contractor.

Also the field tests carried out by the supplier shall be recorded by the contractor.

22) MODE OF MEASUREMENT:

1. Contractor shall be paid for one panel erection as per BOQ Quantities part.

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

3 TECHNICAL SPECIFICATION FOR LDB & PDB

1) SCOPE OF WORK

1. Distribution Boards (DBs) shall be suitable for operation on 3 Phase/single phase,

415/240 volts, 50 cycles, neutral grounded at transformer. The DB shall be minimum di-

electric strength of 1.5 KV / Sec. All Distribution Boards shall manufactured by a

manufacturer listed in Appendix-I.

2. LDB’s shall comply with the latest Relevant Indian Standards and Electricity Rules and

Regulations and shall be as per IS-13947-1991.

2) CONSTRUCTION FEATURES

1. DB’s shall be made out of 1.6 mm thick high quality CRCA sheet steel and shall be pre-

treated and powder coated sheet steel used in the construction of LDB shall be folded and

braced as necessary to provide a rigid support for all component.

2. DB shall be suitable for indoor / outdoor installation, wall mounting free standing type, in

double door construction.

3. The Final Distribution Boards shall be totally enclosed, completely dust and vermin proof

and shall be with hinged doors, Neoprene gasket, padlocking arrangement.

4. All removable/ hinged doors and covers shall be grounded by 1.0 sqm tinned stranded

copper connectors.

5. Final Distribution Boards shall be suitable for the climatic conditions. Joints of any kind in

sheet metal shall be seam welded, all welding, slag shall be rounded off and welding pits

wiped smooth with plumber metal.

6. The general construction shall confirm to IS-8623-1977 (Part-1) for factory built assembled

switchgear & control gear for voltage up to and including 1100 V AC.

7. All panels and covers shall be properly fitted and square with the frame, and holes in the

panelcorrectly positioned. Fixing screws shall enter into holes tapped into an adequate

thickness of metal or provided with wing nuts. Self threading screws shall not be used in

theconstruction of LDBs.

8. Knockout holes of appropriate size and number shall be provided in the LDB’s in conformity

withthe location of cable/conduit connections. Detachable sheet steel gland plates shall be

provided at the top / bottom to make holes for additional cable entry at site if required.

3) DISTRIBUTION BOARDS SHALL COMPRISE OF THE FOLLOWING:

3.1 A panel for mounting where appropriate incoming supply circuit breaker & other

auxiliaries for Control & distribution as required.

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

3.2 Installations accessories shall be part of the DB for fixing conductor and rails for

mounting MCB’s and RCCB’s etc. Neutral bus bars & earthing bus bars required in the

circuit. All busbars in the LDB shall be insulated type.

3.3 Service cable /interconnection shall be part of the Distribution Boards.

3.4 The board shall be installed at a height such that the operating is within reach of the

normal human height i.e. 1.2 to 1.8 meters from finish floor level.

3.5 Degree of protection shall be IP-52 for indoor application, IP-54 for kitchen & laundry

and IP-55 for outdoor application.

3.6 All three phase distribution boards shall have 4 rows and single phase distribution

boards shall have single rows for housing of MCB’s and RCCB’s unless noted

3.7 Phase segregation to be maintained in all three phase distribution boards.

3.8 Earthing shall be provided in each LDB’s.

3.9 MINIATURE CIRCUIT BREAKER (MCB)

3.9.1 MCB's shall have quick make and break no welding self-wiping silver alloy contacts

for 10 KA short circuit both on the manual and automatic operation.

3.9.2 Each pole of the breaker shall be provided with inverse time thermal over load and

instantaneous over current tripping elements, with trip free mechanism.

3.9.3 In case of multi-pole breakers, the tripping must be on all the poles and operating

handle shall be common. Breakers must confirm to BS 3871 with facility for locking

in OFF position.

3.9.4 Pressure clamp terminals for stranded/solid conductor insertion are acceptable up to

4 sq.mm. Aluminium or 1.5 sq.mm.

3.9.5 Copper and for higher ratings, the terminals shall be suitably shrouded. Wherever

MCB isolators are specified they are without the tripping elements.

3.10 RESIDUAL CURRENT CIRCUIT BREAKER CURRENT OPERATED TYPE (RCCB)

3.10.1 The RCCB should suffices all the requirements of IS as per code IS - 12640 - 1988. The

RCA should be current operated and not on line voltage.

3.10.2 The RCCB should ensure mainly the following functions:

o Measurement of the fault current value.

o Comparison of the fault current with a reference value.

o The RCCB should have a torroidal transformer which has the main conductors of

primary (P - N) which check the sum of the current close to zero.

o All metal parts should be inherently resistant to corrosion and treated to make

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

them corrosion resistant. It should be truly current operated. It should operate on

o core balance torroidal transformer. Its accuracy should be ± 5 %. It should

o operate even in case of neutral failure. It should trip at a present leakage current

o within 100 mA Its enclosure should be as per IP 30. Its mechanical operation life

o should be more than 20,000 operations. It should provide full protection as

o envisaged by IE rules - 61-A, 71 - ee, 73 - ee,

1985 and also rule 50 of IE rule1956.

o It should conform to all national and international standards like IS: 8828-1993,

o IS: 12640-1988, BS 4293 - 1983, CEE 27 (International commission Rules for the

approved of electrical equipment).

1. Earthing shall be provided as per IS: 3043-1987.

1. All sheet steel work shall undergo a process of degreasing, pickling in acid, cold rinsing,

phosphating, passivaiting (seven tank processing) and then painted with electrostatic paint

(Powder coating). The shade of colour of panel inside/outside shall be of Siemens gray paint

shade no. RAL-7032 of IS Code No.5.

1. Engraved PVC labels shall be provided on all incoming and outgoing feeder. Circuit diagram

showing the arrangements of the circuit inside the distribution panels shall be pasted on

inside of the panel door and covered with transparent plastic sheet.

1. Testing of panels shall be as per following codes:

i. IS: 8623 (Part -I) 1977 for factory built assemblies of switch gear for voltages upto

and including 1000 VAC.

ii. IS: 13947 : 1993 Degree of protection

1. In wiring a distribution panel it shall be insured that total load of various distribution panel

and/or consuming devices is divided evenly between the phases and number of ways as per

Consultants drawing.

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

9) WORKMANSHIP:

1. The D.B. shall be properly grouted in the wall in concealed manner taking care that the

powder coating is not scratched and dents are not formed on the D.B., MCBs and ELCBs.

2. In the distribution boards shall be fixed as per the circuit details provided.

3. All the wires terminating in the MCBs and the ELCBs shall be lugged for proper contact and

ferrules depicting the circuit nos shall be provided. D.B.s mounted in concealed manner

shall have a groove around it so as to save the finish of the plaster and colour during future

opening of the door.

The distribution boards shall have circuit chart tagged on the door for future maintenance.

4. Danger notice plates shall be fitted to the distribution boards with screws and not stuck so

as to assure its presence for a longer duration.

10) MODE OF MEASUREMENT:

1. The distribution boards shall be measured in Nos as per BOQ Quantities.

4 TECHNICAL SPECIFICATION FOR LT CABLES & CABLE TRAY.

1) SCOPE OF WORK

1. The Medium voltage cables shall be supplied, laid, connected, tested and commissioned in

accordance with the drawings, specifications, relevant Indian Standards specifications,

manufacturer’s instructions. The cables shall be delivered at site in the original drums with

manufacturer’s name, size and type clearly written on the drums.

2. All cables shall be adequately protected against any risk of mechanical damage to which

they may be liable in normal conditions of handling during transportation, loading,

3. The cable shall be supplied in single length i.e. without any intermediate joint or cut unless

specifically approved by the client.

The cable ends shall be suitably sealed against entry of moisture, dust, water etc. with cable

4. compound as per standard practise.

1. The MV cables shall be cross linked polyethylene (XLPE) insulated PVC sheathed of

volts grade as asked for in the schedule of quantities. Cables upto 10 sq.mm shall be with

copper conductor and 16 sq.mm and above shall be with aluminium conductor.

3) Technical Requirements:

1. All XLPE Aluminium/Copper Power cables shall be 1100 Volts grade, multi core

constructed as per IS : 7098 Part-I of 1988 as follows :

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

1.1 Stranded Aluminium /Copper conductor in case of 10 sq.mm. And above whereas solid

conductor in case of 10 sq.mm. And below.

1.2 Cores laid up.

1.3 The inner sheath should be bonded over with thermo-plastic material for protection

against mechanical and electrical damage.

1.4 Armoring should be provided over the inner sheath to guard against mechanical damage.

Armouring should be Galvanised steel wires or galvanised steel strips. (In single core

cables used in A.C. system armouring should be non-magnetic hard aluminium

Wires/Strips. Round steel wires should be used where diameter over the inner sheath

does not exceed 13 mm; above 13 mm flat steel armour should be used. Round wire of

different sizes should be provided against specific request.)

1.5 The outer sheath should be specially formulated heat resistant black PVC compound

conforming to the requirement of type ST2 of IS: 5831-1984 extruded to form the outer

2. Conductor shall be of electrolytic Aluminium/Copper conforming to IS : 8130 and are

compact circular or compact shaped.

3. Insulation shall be of XLPE type as per latest IS general purpose insulation for

maximum rated conductor temperature 70 degree centigrade.

4. In Inner sheath laid up cores shall be bonded over with thermoplastic material for

protection against mechanical and electrical damage.

Insulation, inner sheath and outer sheath shall be applied by extrusion and lapping up

5. process only.

6. Uncoated, annealed copper / aluminium, of high conductivity, upto 4 mm2 size the

conductor shall be solid and above 4 mm2 the conductors shall be concentrically stranded

7. Repaired cables shall not be used.

8. Current ratings of the cables shall be as per IS:

9. The XLPE insulated cables shall conform to latest revision of IS and shall be read along with

this specifications. The Conductor shall be stranded Aluminium/Copper circular/ sector

shaped and compacted. In multi core cables the core shall be identified by red, yellow, blue

and black coloring of insulation.

10. The cables shall be suitable for laying in racks, ducts, trenches, conduits and underground

buried installation with uncontrolled back fill and chances of flooding by water.

11. Progressive automatic in line sequential marking of the length of cables in meters at every

one meter shall be provided on the outer sheath of all cables.

12. Cables shall be supplied in non returnable wooden drums as per IS:

13. Both ends of the cables shall be properly sealed with PVC/Rubber caps so as to eliminate

ingress of water during transportation, storage and erection.

14. The product should be coded as per IS: - 7098 Part-I as follows:-

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

Aluminium Conductor A

XLPE Insulation 2X

Steel round wire armour W F

Steel strip armour WW

Steel Double round wire armour

Steel Double strip armour FF

Non-magnetic (Al.) round wire armour WA

Non-magnetic (Al.) strip armour Fa

PVC outer sheath Y

4) CoreIdentifications:

Two core : Red and Black

Three core : Red, Yellow and Blue

Four core : Red, Yellow, Blue and Black

Single core : Green, Yellow for earthing.

Black shall always be used for neutral.

1. All cables shall be inspected by the contractor upon receipt at site and checked for any

damage during transit.

6) Joints in Cables

1. The Contractor shall take care to see that all the cables received at site are apportioned to

various locations in such a manner as to ensure maximum utilization and avoid cable

2. This apportioning shall be got approved by the Owner’s site representative before the cables

are cut to lengths.

3. Where joints are unavoidable heat shrinkable type joints shall be made.

4. The location of such joints shall be got approved from the Owner’s site representative

and shall be identified through a marker.

7) Jointing Boxes for Cables

1. Cable joint boxes shall be installed with heat shrinkable sleeve and of appropriate size,

suitable for XLPE armoured cables of particular voltage rating.

8) Jointing of Cables

1. All cable joints shall be made in suitable, approved cable joint boxes and the filling in of

compound shall be done in accordance with manufactures’ instructions and in an approved

manner. All straight through joints shall be done in epoxy mould boxes with epoxy resin.

2. All cables shall be joined colour to colour and tested for continuity and insulation resistance

before jointing commence.

3. The seals of cables must not be removed until preparations for jointing are completed.

4. Joints shall be finished on the same day as commenced and sufficient protection from the

weather shall be arranged.

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

5. The conductors shall be efficiently insulated with high voltage insulating tape and by using

of spreaders of approved size and pattern.

6. The joints shall be completely topped up with epoxy compound so as to ensure that the box

is properly filled.

9) Cable End Terminations

1. Cable end termination shall be done in cable terminal box using crimping sockets and

proper size of glands of double compression type.

2. Solderiess crimping type Aluminium/Cu lugs conforming to IS suitable for cable size evenly

crimped with high pressure tool & connected to switchgear terminals with brass/cadmium

plated nut bolts in an approved manner.

10) Bonding of Cables

1. Where a cable enters any piece of apparatus, it shall be connected to the casing by means of

an approved type of armour clamp and gland.

2. The clamps must grip the armouring firmly to the gland or casing, so that no undue stress is

passed on to the cable conductors.

11) Cable Installation in Cable Trays and Cable Trenches.

1. Cables shall be laid by skilled and experienced workmen using adequate rollers to

minimize stretching of the cable.

2. The cable drums shall be placed on jacks before unwinding the cable. Great care shall be

exercised in laying cables to avoid forming kinks.

12) Laying of Cables on Cable Trays

1. The relative position of the cables, laid on the cable tray shall be preserved and the cables

shall not cross each other.

2. At all changes in direction in horizontal and vertical planes, the cable shall be bent smooth

with a radius as recommended by the manufacturers.

3. All cables shall be laid with minimum one diameter gap and shall be clamped at every meter

to the cable tray.

4. Cables shall be tagged for identification with aluminium tag and clamped properly at every

5. Tags shall be provided at both ends and all changes in directions both sides of wall and floor

6. All cable shall be identified by embossing on the tag the size of the cable, place of origin and

7. All cables passing through holes in floor or walls shall be sealed with fire retardant Sealant

and shall be painted with fire retardant paint upto one meter on all joints, terminations

and both sides of the wall crossings by “VIPER CABLE RETARD”.

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

8. This method may be adopted in places like indoor substations, air-conditioning plantrooms,

generator rooms etc. or where long horizontal runs of cables are required withinthe

building and where it is not convenient to carry the cable in open ducts.

9. This method is preferred where heavy sized cables or a number of cables are required to be

laid. The cable trays may be either of perforated sheet type or of ladder type.

PERFORATED TYPE CABLE TRAY

10. The cable tray shall be fabricated out of slotted/perforated MS sheets as channel sections,

single or double bended. The channel sections shall be supplied in convenient lengths and

assembled at site to the desired lengths. These may be galvanished or painted as specified.

Alternatively, where specified, the cable tray may be fabricated by two angle irons of

50mmX50mmX6mm as two longitudinal members, with cross bracings between them by

50mmX5mm flats welded/bolted to the angles at 1 m spacing. 2mm thick MS perforated

sheet shall be suitably welded/bolted to the base as well as on the two sides.

11. Typically, the dimensions details to be considered as per BOQ.

12. The jointing between the sections shall be made with coupler plates of the same material

and thickness as the channel section. Two coupler plates, each of minimum 200mm length,

shall be bolted on each of the two sides of the channel section with 8mm dia round headed

bolts, nuts and washers. In order to maintain proper earth continuity bond, the paint on the

contact surfaces between the coupler plates and cable tray shall be scraped and removed

before the installation.

13. The width of the cable tray shall be chosen so as to accommodate all the cables in one tier,

plus 30 to 50% additional width for future expansion. This additional width shall be

minimum 100mm. The overall width of one cable tray shall be limited to 800mm.

14. Factory fabricated bends, reducers, tee/cross junctions, etc. shall be provided as per good

engineering practice. (Details are typically shown in figure 3). The radius of bends, junctions

etc. shall not be less than the minimum permissible radius of bending of the largest size of

cable to be carried by the cable tray.

15. The cable tray shall be suspended from the ceiling slab with the help of 10mm dia MS

rounds or 25mmX5mm flats at a span spacing of 1mtr.

16. Flat type suspenders may be used for channels upto 450mm width bolted to cable trays.

17. Round suspenders shall be threaded and bolted to the cable trays or to independent support

angles 50mmX50mmX5mm at the bottom end as specified. These shall be grouted to the

ceiling slab at the other end through an effective means, as approved by the Engineer-in-

Charge, to take the weight of the cable tray with the cables.

18. The entire tray (except in the case of galvanized type) and the suspenders shall be painted

with two coats of red oxide primer paint after removing the dirt and rust, and finished with

two coats of spray paint of approved make synthetic enamel paint.

19. The cable tray shall be bonded to the earth Terminal of the switch bonds at both ends.

20. The cable trays shall be measured on unit length basis, along the center line of the cable

tray, including bends, reducers, tees, cross joints, etc. and paid for accordingly

LADDER TYPE CABLE TRAY

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

21. The ladder type of cable tray shall be fabricated of double bended channel section

longitudinal members with single bended channel section rungs of cross members welded

to the base of the longitudinal members at a center to center spacing of 250cm.

22. Alternatively, where specified, ladder type cable trays may be fabricated out of

50mmX50mmX6mm (minimum) angle iron for longitudinal members, and 30mmX6mm flat

23. Typical details of fabrication and dimensions of both the types of trays are shown in figure

4A, B, C and D.

24. The maximum permissible loading, jointing of channel sections, width of the cable tray,

provision of elbows, bends, reducers, horizontal tee/ cross junctions etc. suspension of cable

tray from the ceiling slab; painting and measurement of the cable tray shall be as per sub-

clauses (ii) to (x) below clause 2.6.11.2, except that the overall width of one cable tray may

be limited to 800mm.

13) Laying of Cables in Ground

1. Cable trench shall be dug to the minimum depth of 1 mtr and the width shall dependent on

the no of cables to be kept with the layer of brick in between two cables.

EXCAVATION OF TRENCHES :

2. The trenches shall be excavated in reasonably straight lines.

3. Wherever there is a change in direction, suitable curvature shall be provided.

4. Where gradients and changes in depth are unavoidable, these shall be gradual.

5. The excavated soil shall be stacked firmly by the side of the trench such that it may not fall

back into the trench.

6. The bottom of the trench shall be levelled and shall be made free from stone, brick bats etc.

The trench shall then be provided with a layer of clean, dry sand cushion of not less than

100 mm in depth.

itfycaanbdleisn, stu

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The cable drum shall be properly mounted on jacks, at a suitable location, making sure that

the spindle, jack etc. are strong enough to carry the weight of the drum and the spindle is

8. Cable shall be pulled over rollers in the trench steadily and uniformly without jerks

and strains. The entire drum length shall be laid in one stretch.

9. However, where this is not possible the remainder of the cable shall be removed by `Flaking’

i.e. By making one long loop in the reverse direction.

10. After the cable has been uncoiled and laid into the trench over the rollers, the cable shall

be lifted off the rollers beginning from one end by helpers standing about 10 meters apart

and laid in a reasonably straight line.

11. Cable laid in trenches in a single tier formation shall have a cover of clean, dry sand of not

less than 150 mm. above the base cushion of sand before the protective cover is laid.

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

12. In the case of vertical multi-tier formation after the first cable has been laid, a sand

cushion of 300 mm shall be provided over the initial bed before the second tier is laid.

13. Finally the cables shall be protected by second class bricks before back filling the trench.

The buried depth of uppermost layer of cable shall not be less than 750mm.

14. Back Filling : The trenches shall be back filled with excavated earth free from stones or

other sharp edged debris and shall be rammed and watered, if necessary, in successive

layers not exceeding 300 mm. Unless otherwise specified, a crown of earth not less than

50 mm in the centre and tapering towards the sides of the trench shall be left to allow for

14) Route Marker

1. Route marker shall be provided along straight runs of the cables not exceeding 30 meters

also for change in the direction of the cable route and underground joints.

2. Route marker shall be of cast iron painted with aluminium paint.

3. The size of marker shall be 100 mm dia with “Cable” and voltage grade inscribed on it.

15) Testing of Cables

1. Cables shall be tested at works for all routine tests as per IS including the following tests

before being dispatched to site by the project team.

a) Insulation Resistance Test.

b) Continuity resistance test.

c) Sheathing continuity test.

d) Earth test.(in armoured cables)

e) Hi Pot Test.

2. Test shall also be conducted at site for insulation between phases and between phase and

earth for each length of cable, before and after jointing.

3. On completion of cable laying work, the following tests shall be conducted in the presence of

the Owner’s site representative.

f) Insulation Resistance Test( Sectional and overall)

g) Continuity resistance test.

h) Sheathing continuity test.

4. All tests shall be carried out in accordance with relevant Standard Code of Practice and

Electricity Rules.

5. The Contractor shall provide necessary instruments, equipment and labour for

conducting the above tests and shall bear all expenses in connection with such tests.

6. All tests shall be carried out in the presence of the Owner’s site representative, results will

be noted and signed by all present and record be maintained.

16) WORKMANSHIP

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

1. Cables shall be laid in the routes marked in the drawings. Where the route is not marked,

the Contractor shall mark it out on the drawings and also on the site and obtain the approval

of the CLIENT AND/OR ITS ARCHITECT before laying the cable.

2. Procurement of cables shall be on the basis of actual site measurements and the quantities

shown in the schedule of work shall be regarded as a guide only.

3. Cables shall be laid on walls, cable trays, inside shafts or trenches.

4. Saddling or support for the cable shall not be more than 500 mm apart. Plastic identification

tags shall be provided at every 30 m.

5. Cables shall be bent to a radius not less than 12 (twelve) times the overall diameter of the

cable or in accordance with the manufacturer's recommendations whichever is higher.

In the case of cables buried directly in ground, the cable route shall be parallel or

6. perpendicular to roadways, walls etc unless marked on drawing by architect / consultant.

Cables shall be laid on an excavated, graded trench, over a sand or soft earth cushion to

provide protection against abrasion.

8. Cables shall be protected with brick or cement tiles on all the three sides as shown on

drawings. Width of excavated trenches shall be as per drawings.

9. Back fill over buried cables shall be with a minimum earth cover of 750 mm to 1000 mm.

The cables shall be provided with cables markers at every 10 meters and at all loop points.

10. All cables shall be full runs from panel to panel without any joints or splices.

11. Cables shall be identified at end termination indicating the feeder number and the

Panel/Distribution board from where it is being laid.

12. Cable termination for conductors up to 4 sq.mm. May be insertion type and all higher sizes

shall have compression type lugs.

13. Cable termination shall have necessary brass glands. The end termination shall be insulated

with a minimum of six half-lapped layers of PVC tape. Cable armouring shall be earthed at

14. In case of cables entering the buildings. It would be done duly only through pipes. The pipes

shall be laid in slant position, so that no rainwater may enter the building.

15. After the cables are tested the pipes shall be sealed with M. seal & then tarpaulin, shall be

wrapped around the cable for making the entry watertight.

16. Testing : MV cables shall be tested upon installation with a 500 V Meggar and the following

readings established:

16.1 Continuity on all phases.

16.2 Insulation Resistance.

16.3 Between conductors.

16.4 All conductors and ground.

16.5 All test readings shall be recorded and shall form part of the completion

16.6 Cable joints shall be done as per regular practice and check shall be carried out for

loose connections and leakages. Insulation cutting shall be done properly taking care

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

that no area of the conductor remains exposed. Crimping shall be done with the help of

hydraulic tool. Proper insulation tape shall be applied at the cable and lug joint.

17. Format for cable testing certificate :

a. Drum no. from which cable is taken :

b. Cable from to

c. Length of run of this cable mtr

d. Insulation resistance test

Between core 1 to earth mega-ohm

Between core 2 to earth mega-ohm

Between core 3 to earth mega-ohm

Between core 1 to core 2 mega-ohm

Between core 2 to core 3 mega-ohm

Between core 1 to core 3 mega-ohm

e. High voltage test: Voltage Duration

Between core and earth

Between individual cores

18. The cable shall be laid side by side in trench with brick covering on all the three sides.

19. The trench shall be such that sharp bends shall be avoided while laying the cable.

20. The bedding of fine sand under the cable shall be not less than 6 mm. The trench shall be

terminated in Manholes with specified size of R.C.C. Hume pipes as shown in drawing. Cable

markers shall be provided through out the route of cable at 10 mtrs distance.

21. The trenches shall be refilled after the cable are laid and the Ground level shall be done as

per original after pressing the same. The cables shall be checked for insulation resistance

and continuity tests shall be carried out.

17) MODE OF MEASUREMENT:

17.1 Mode of Measurement for Cable Trench & Cable Tray.

The cable laying shall be measured in rmt. The trenches dug and refilled shall be

measured in cu. Mtr. The bricks and sand bedding shall be measured in rmt. The cable

trays shall be measured in rmt.

17.2 Mode of Measurement for Cable and Cable End Terminations.

The cables shall be measured in rmt and terminations on unit basis.

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

5 TECHNICAL SPECIFICATION FOR INTERNAL WIRING.

1) SYSTEM OF WIRING

1. The system of wiring shall consist of PVC insulated copper stranded conductor flexible FRLS

wires in metallic / non metallic (Rigid heavy/Medium Duty ISI -marked fire retarded PVC

Conduits of minimum 2mm Wall thickness and Sizes of conduits shall be 25 mm dia.

conduits for both mains and point wiring and shall be concealed or surface mounted above

false ceiling as called for.

2) GENERAL DESCRIPTION

1. Prior to laying and fixing of conduits, the contractor shall mark the conduit route, carefully

examine the working drawings prepared by him and approved by the Consultant indicating

the layout, satisfy himself about the non interference in the route, sufficiency of number and

sizes of conduits, location of junction boxes, sizes and location of switch boxes and other

relevant details.

2. Any discrepancy found shall be brought to the notice of the Owner’s site representative.

3. Any modifications suggested by the contractor should get written approval before the actual

laying of conduits is commenced.

4. In laying of conduits it is important that not more than two right angle bends are provided

for each circuit without a pull box.

5. No junction box shall be provided in the entire length of conduit run for drawing of wires.

6. Only switch outlets, lighting fixture outlets, equipment power outlets and socket outlets

shall be considered for drawing of wires.

3) LIGHTING & POWER WIRING

1. All final branch circuits for lighting and appliances shall be single conductor/ stranded/

flexible wires run inside conduits.

2. The conduit shall be properly connected or jointed into sockets, bends, and junction boxes.

3. Branch circuit conductor sizes shall be as shown in the schedule of quantities and or

4. All circuits shall preferably be kept in a separate conduit up to the Distribution Board. No

other wiring shall be bunched in the same conduit except those belonging to the same

5. Each lighting branch circuit shall not have more than ten outlets or 800 watts whichever is

lower. Each conduit shall not hold more than three branch circuits.

6. Flexible cords for connection to appliances, fans and pendants shall be 650/1100 V grade

(three or four cores i.e. with insulated neutral wire of same size) with tinned stranded

copper wires, insulated, twisted and sheathed with strengthening cord. Colour of sheath

shall be subject to the CLIENT AND/OR ITS ARCHITECT’S approval.

7. Looping system of wiring shall be used. Wires shall not be jointed. Where joints are

unavoidable, they shall be made through approved mechanical connectors.

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

8. No such joints shall be made unless the length of the sub-circuit, sub-main or main is more

than the length of the standard coil.

9. Control switches shall be connected in the phase conductors only and shall be `ON' when

knob is down. Switches shall be fixed in 3 mm. thick painted or galvanized steel boxes with

cover plates as specified. Cadmium plated brass screws shall be used.

10. Power wiring shall be distinctly separate from lighting wiring. Conduits not less than

mm.and wires not less than 1.0 sq.mm. Copper shall be used.

11. Every conductor shall be provided with identification ferrules at both ends matching the

1. The entire installation shall be tested for:

Insulation resistance.

Earth continuity.

Polarity of single pole switches.

2. All the wiring switch board, outlet points shall be done in a concealed manner in wall & slab

in PVC conduit of minimum 25 mm dia. (medium gauge) & with 650v / 1100v grade PVC

insulated flexible copper conductor wire.

3. The switches should be modular with moulded cover plates, blank plates for outlet boxes.

4. The accessories, connectors, sockets, should be fixed with brass chrome / cadmium plated

machine screw. For fan points the rates should be with hum -free type 300 W regulators as

required to complete the point wiring.

5. The wiring shall be as per IS: 732 and IS: 4648. The wiring shall be done in a looping manner

so as to avoid junction boxes at any place.

6. All the looping shall be done only in the switchboard and outlet points. The size of the wire

shall be as per the specification. Colour code shall be strictly followed.

The size of wires shall as follow as per BOQ and as per clients requirements:

Light, fans, exhaust fan, 5 Amp. On board plug point, two way light points, bell point etc from

switch to outlet.

Phase / Neutral 1.5 m m2

9. From D.B. to switch board – lighting / 5 A socket etc – i.e. circuit mains part of point wiring

Phase / Neutral 2.5 m m2

10. From D.B. to 16A power point etc – i.e. circuit mains part of point wiring

Phase / Neutral 4.0 m m2

11. Separate pipes shall be laid for off wires and circuit mains.

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

12. Circuit mains of same phase shall be drawn in one pipe with prior permission/discussion

with the consultant.

13. Separate phase, neutral and earthing wire of sizes recommended by consultant shall be

drawn for each and every circuit mains.

14. Mains for lighting and on board plug points shall be of one-size higher wires than those used

5) COMPUTER WIRING :

1. Wiring for short extensions to outlets in hung ceiling or to vibrating equipments, motors

etc., shall be installed in flexible conduits. Otherwise rigid conduits shall be used. No flexible

extension shall exceed 1.25 m.

2. Conduits run on surfaces shall be supported on metal 12 mm. thick G.I. pressure saddles

which in turn are properly screwed to the wall or ceiling. Saddles shall be at intervals of not

more than 500 mm.

3. Fixing screws shall be with round or cheese head and of rust-proof materials. Exposed

conduits shall be neatly run parallel or at right angles to the walls of the building.

4. Unseemly conduit bends and offsets shall be avoided by using fabricated mild steel

junction/pull through boxes for better appearances.

5. No cross-over of conduits shall be allowed unless it is necessary and entire conduit

installation shall be clean and neat in appearance.

6. Conduits embedded into the walls shall be fixed by means of staples at not more than

mm. intervals. Chases in the walls shall be neatly made and refilled after laying the conduit

and brought to the finish of the wall but the building Contractor will do final finish.

7C .o nduits buried in concrete structure shall be put in position and securely fastened to the

reinforcement and got approved by the CLIENT AND/OR ITS ARCHITECT, before the

concrete is poured.

8P .roper care shall be taken to ensure that the conduits are neither dislocated nor choked at

the time of pouring the concrete suitable fish wires shall be drawn in all conduits before

they are embedded.

9. Where conduit passes through expansion joints in the building, adequate expansion fittings

shall be used to take care of any relative movement.

10. Inspection boxes shall be provided for periodical inspection to facilitate withdrawal and

removal of wires. Such inspection boxes shall be flush with the wall or ceiling in the case of

concealed conduits. Inspection boxes shall be spaced at not more than 12 meters apart or

two 90° solid bends or equal.

11. All junction and switch boxes shall be covered by 6 mm clear plate. These junction boxes

shall form part of point wiring or conduit wiring as the case may be including the cost of

removing the cover for painting and re-fixing. No separate charges shall be allowed except

where specially mentioned.

12. Conduits shall be free from sharp edges and burrs and the threading free from grease or oil.

The entire system of conduits must be completely installed and rendered electrically

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

continuous before the conductors are pulled in. Conduits should terminate in junction boxes

of not less than 32 mm. deep.

13. An insulated earth wire of copper rated capacity shall be run in each conduit.

The point definition shall be conduiting and wiring from D.B. to S.B. and there

from to final outlet point including switches and accessories, junction boxes, fan

boxes, zarri work with cement –sand etc of approved make.

1. All PVC insulated copper conductor flexible FRLS wires shall conform in all respects to

Standards as listed under sub-head Indian Standards and shall be IS approved and ISI

7) BUNCHING OF WIRES

1. Wires carrying current shall be so bunched that the outgoing and return wires are

drawn into the same conduit.

2. Wires originating from two different phases shall not run in the same conduit. All wires shall

have ferrules for identification.

3. Lighting and power circuits shall be separate. Each Power/ Light Circuit‘s Neutral shall be

individual per Circuit and shall not be looped from any other Circuit.

8) LOAD BALANCING

1. Balancing of circuits in three phase installation shall be as planned by the Consultants in the

tender drawings and shall be checked by the contractor before the commencement of wiring

and shall be strictly adhered to.

9) COLOUR CODE OF CONDUCTORS

1. Colour code shall be maintained as indicated by the Consultant for the entire wiring

installations. Red, yellow, blue shall be for three phases, black for neutral and green with

yellow band shall be for earthing.

10) WORKMANSHIP

Drawing Conductors

1. The drawing and jointing of PVC insulated copper conductor wires shall be executed with

due regard to the following precautions.

2. While drawing wires through conduits, care shall be taken to avoid scratches and kinks

which may cause breakage of conductors.

3. There shall be no sharp bends. Wire reel stands to be used for pulling of wires to avoid

4. Care shall be exercised while drawing the wires from reels, by taking appropriate measures

to ensure that wires are not spread on ground, causing dust and dirt accumulation on the

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

5. Maximum permissible number of 1100 volt grade PVC insulated wires that may be drawn

into rigid non metallic or PVC Conduits are given below.

Size of wires Nominal Maximum number of wires within conduit

Cross Section Area (Sq. size(mm)

6. Insulation shall be removed by insulation stripper only. Few Strands of wires shall not be

cut/reduced for convenience in connecting into terminals.

7. The terminals shall have sufficient cross sectional area to take all strands and its

connecting brass screws shall have flats ends.

All looped joints shall be connected through terminal block/connectors. The pressure

8. applied to tighten terminal screws shall be just adequate, neither too much nor too

less. All light points shall be terminated through a connector.

9. Only licensed wiremen (Before doing the work or before appointing him on site contractor

has to submit his wiring licence to Owner) and cable jointers shall be employed to do

10. Before entrusting cable jointing work to any technician, or before appointing Cable Jointers

or Wiremen on Site, Contractor has to submit such Technicians’ / Wireman’s / Cable

Jointer’s licence to Owner.

11. All wires and cables shall be embossed with the manufacturer’s label with ISI mark and shall

be brought to site in original packing. For all internal wiring. PVC insulated wires of

volts grade (FRLS) shall be used.

12. The sub-circuit wiring for point shall be carried out in loop system and no joints shall be

allowed in the length of the conductors.

13. No wire shall be drawn into any conduit until all defective work of conduit installation of

any nature that may cause injury to wire is completed.

14. Care shall be taken while pulling out the wires so that no damage occurs to conduits/wire

itself, the conduits shall be thoroughly cleaned of moisture, dust, dirt or any other

15. The minimum size of PVC insulated copper conductor wires for all sub-circuit wiring for

light points shall be minimum 1.0 sq.mm copper. Separate neutral to be pulled for each

16. Conduits shall be kept at a minimum distance of 100 mm. from the pipes of other

non-electrical services. And maintain minimum 300 mm distance between telephones, TV &

Computer piping.

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

17. Separate conduits/raceways shall be used for following points as applicable and as

requirements of site conditions:

17.1 Normal lights and 5 a 3 pin sockets on lighting circuit.

17.2 Separate conduit shall be laid from D.B. to switch board.

17.3 Power outlets - 15 A 3 pin 20 A/30 A, 2 pin scraping earth metal clad sockets.

17.4 Emergency lighting.

17.5 Telephones.

17.6 Fire alarm system.

17.7 Public address system & Music system.

17.8 For all other voltages higher or lower than 230 V.

17.9 T.V. Antenna.

17.10 Water level guard.

1. To facilitate subsequent drawing of wires in the conduit, GI fish wires of 1.0 mm (14 SWG)

shall be provided along with the laying of recessed conduit.

12) MODE OF MEASUREMENT

1. The items shall be measured on unit basis or on mtr basis as per BOQ.

6 TECHNICAL SPECIFICATION FOR LIGHT FIXTURES & ACCESSORIES.

1 The scope of work shall cover the supply, installation and testing of various types of LED

light fixtures.

Thefollowing standards and rules shall be applicable :

- IS 3646 - 1960 Code of practice for interior illuminator.

(B) IS 1913 - 1969 General and Safety requirements for

Electric lighting fittings.

(C) Indian Electricity Act and Rules issued thereunder.

1 All codes and standards mean the latest. Where not specified otherwise the installation

shall generally follow the Indian Standard Code of Practice or the relevant British Standard

Code of Practice in the absence of Indian Standard.

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

3) GENERAL REQUIREMENTS :

Tube Light with integral/ non-integral driver 20-22 Watts, Surge - 4KV,IP-20 LED

indoor fittings with LEDs of wattage 0.2 Watt to 0.5 Watt assembled on single

MCPCB, with housing used as a heat sink shall be made of thick sheet Steel

conforming to IS: 513/CRCA polyester powder coated and high U.V. & corrosion

resistance with diffuser and/or Polycarbonate optics with company mark/name

to 300 V, Power Factor more than 0.9, THD < 10 %,CCT 4000 K to 6500K, Uniformity

ratio >0.7,Luminaire efficacy> 100 lumens/watt ,LED driver efficiency > 85 %

LED Lamps integral type, cool white with PC diffuser suitable for B22 LAMP holder

to 8 watts LED indoor fittings with LEDs of wattage 0.2 Watt to 0.5 Watt assembled

on single MCPCB, with housing used as a heat sink shall be made of thick sheet Steel

conforming to IS: 513/CRCA polyester powder coated and high U.V. & corrosion

resistance with diffuser and/or Polycarbonate optics with company mark/name

to 300 V,Power Factor more than 0.9, THD < 10 %,CCT 4000 K to 6500K, Uniformity

ratio >0.7,Luminaire efficacy> 100 lumens/watt ,LED driver efficiency > 85 %

LED Panel Light with provision for Plane front frame with translucent cover fixed to

housing complete 24 watts, 300 x 300 mm, Surge-4 KV LED indoor fittings with LEDs

of wattage 0.2 Watt to 0.5 Watt assembled on single MCPCB, with housing used as a

heat sink shall be made of thick sheet Steel conforming to IS: 513/CRCA polyester

wi thp do iwffdues rercoa antde/doar nd high U.V. & corrosion resistance

Polycarbonate optics with company mark/name 120 to 300 V, Power Factor more

than 0.9, THD < 10 %,CCT 4000 K to 6500K, Uniformity ratio >0.7,Luminaire

efficacy> 100 lumens/watt ,LED driver efficiency > 85 %

LED Panel Light with provision for Plane front frame with translucent cover fixed to

housing complete up to 36 watts, 600 x 600 mm, Surge- 4KV LED indoor fittings with

LEDs of wattage 0.2 Watt to 0.5 Watt assembled on single MCPCB, with housing used

as a heat sink shall be made of thick sheet Steel conforming to IS: 513/CRCA

polyester powder coated and high U.V. & corrosion resistance with diffuser and/or

Polycarbonate optics with company mark/name 120 to 300 V, Power Factor more

than 0.9, THD < 10 %,CCT 4000 K to 6500K, Uniformity ratio >0.7,Luminaire

efficacy> 100 lumens/watt ,LED driver efficiency > 85 %

4) DRAWINGS AND DATA:

As per of the proposal the bidder furnish relevant descriptive and illustrative literature on

lighting fixtures and accessories and following drawings/ data for the respective lighting

i) Dimensional Drawings.

ii) Mounting details cable entry facilities and weights.

iii) Light distribution diagrams (Zonal & Isokandora)

iv) Light absorption and utilisation factors.

v) Lamp output V/S temp. Curves.

5) WORKMANSHIP:

The fixture shall be installed on wall / ceiling as directed and as per manufacturer's

instruction, with necessary accessories for surface, concealed, suspended from ceiling,

bracket mounting etc.

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

The job also includes connection of fixture with respective outlet point with heat resistant

wires through heat resistance sleeve and PVC connector. The exhaust fan shall be

installed complete with M.S. angle iron mounting frame/ ring, G.I. louvers, wire mesh and

plug at the end of the cord including wiring & earthing etc. Proper earthing shall be

provided to the fixtures.

6) MODE OF MEASUREMENT:

The unit rate shall be considered for fitting one fixture. The rate shall include following

1 All fixing accessories, mounting bracket, ballast condensers and control gear wherever

Supplying and fixing Ball and socket joints wherever required.

Earthing of fittings.

4 Electrical connections to fittings/fans from the junction box/ceiling rose.

5 Installation and interconnection of Electronic regulators for ceiling fans.

6 Supplying and fixing 300 mm. GI down rod for ceiling fans.

7 TECHNICAL SPECIFICATION FOR DATA, TELEVISION & TELEPHONE WIRING.

1) GENERAL DESCRIPTION

1. The work shall cover the supply and installation of the TV, Telephone and Computer data

points including laying of Cables in 19/20 mm dia PVC Conduit.

TELEPHONE CABLES AND WIRES:

1. The type of cables and the services shall be as follows:

2. Indoor – Multipair PVC sheath armoured / un-armoured as specified 0.6 mm tin Cu. Cable.

3. Outside -- Multipair PVC sheath armoured / jelly filled as specified 0.6 mm tin Cu. Cable.

4. All multi core cables and wires shall be of tinned copper conductor of not less than 0.6 mm

dia and shall be colour coded twisted pairs with rip cord.

The conductor resistance shall be less than 150 ohms per KM and the insulation resistance

between the conductors not less than 50 mega ohms and the nominal capacitance of about

0.1 microfarad per kilometre.

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

6. Cables laid underground or locations subject to dampness and flooding shall be filled with

polyethylene compound and shall have sufficient protection against moisture and water

7. All armouring shall be of galvanized steel wires and protected against corrosion by an outer

sheath of PVC in the case of indoor cables and polyethylene in the case of outdoor cables.

Outer sheathing must be fire retarding and anti-termite.

8. All un-armoured single core cables and inner sheath of armoured cables shall be provided

TELEPHONE TAG BLOCKS:

9. The telephone tag blocks shall be suitable for the multi core telephone cables and shall have

two terminal blocks, cross connect type. All incoming and outgoing cables shall be

terminated on separate terminal blocks and termination shall be silver soldered. The cross

connecting jumpers shall be insulated wires of same diameter and screw connected.

10. The tag blocks shall be mounted inside fabricated sheet steel boxes with removable hinged

covers and shall be fully accessible. The enclosure shall be painted with 2 coats of red oxide

and stove enamelled.

TELEPHONE OUTLET SOCKET:

11. Telephone outlet socket shall be of the same make as that of the switches and accessories.

The outlet sockets shall consist of 2 A 2 Pair polyethene connector in M.S.I / PVC boxes with

switch plate of the same make as that of switches and telephone socket. The telephone

outlet socket unless and otherwise specified shall be jack type and not pin type.

COMPUTER WIRES:

12. The computer wires shall be of 4 pair enhanced Cat 6 category and shall be of the makes as

specified in the tender.

COMPUTER DATA OUTLET SOCKETS:

13. The computer sockets shall be of e Cat 6 category and of the make specified in the tender.

The sockets shall be installed in the plates of the modular switches range to be used. The

sockets shall be crimped using crimping tool with the Cat 6e wire.

14. For clean room application the plates shall be of SS 316 with no sharp edges.

TELEVISION WIRING & SOCKETS:

15. The Co-axial cable shall be of wide band type with operation capability upto 500 MHz.as of

16. The Co-axial cable shall comprise of inner conductor of solid bare copper insulated with

Foam PE & Secondary Conductor made of poly-Aluminium film bonded Aluminium braids

and having coverage of 65%, overall sheathed with black PVC Insulation.

17. Twisted cables shall be electrolytic grade annealed copper conductor insulated with PE

insulation twisted in to pairs with colour combination bunched together in concentric layers

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

so as to minimize cross-talk & wrapped with FR PVC taps and sheathed with FR PVC or

HFFR outer jacket suitable for indoor telephone wiring and confirming to C-DOT S/WS-

113/ IEC 60189-2, UL-1581 SECTION

18. The ageing resistance of the co-axial cable shall comply with DIN 47252, Part 2, i.e. max.

5% increase in attenuation at 200 MHz. measured by artificial ageing (14 days at 80 deg.

1. All cables shall be on cable racks and neatly stitched together.

2. The connection at the tag blocks shall be silver soldered so as to achieve minimum

contact resistance.

The final branch connections with single pair cables in conduits and the maximum

number of cables in each conduit shall be as follows:

Conduit diameter Max. No. of cables

1" 25 2 Nos. single pair

1¼" 6 Nos. Single pair

32 12 Nos. Single pair

40 18 Nos. single pair

4. The tag blocks shall be mounted inside fabricated sheet steel boxes with removable hinged

covers and shall be fully accessible. The enclosure shall be painted with 2 coats of red oxide

and stove enamelled.

4) MODE OF MEASUREMENT

1. The wires, conduits and raceways shall be measured in rmt whereas the outlet sockets,

junction boxes and tag blocks shall be measured in units.

Technical Specification for Solar System:

This technical specification for a 25 kWp Battery-less (On-Grid) Solar Power Plant

is reorganized for maximum clarity, following industrial tender standards.

1. Solar PV Modules and Array

The Solar PV modules are the primary generation source and must meet stringent quality and

durability standards.

• Technology: Crystalline Silicon (Mono or Multi) using high-power cells.

• Total Capacity: 25 kWp (25000 Wp).

• Module Efficiency: Electrical conversion efficiency must be $\ge 12\%$.

• Power Tolerance: Rated output power must not vary more than $3\text{--}5\%$ from the

average rating.

• Certification Standards:

o Design Qualification: IEC 61215 / IS

o Safety Qualification: IEC 61730 Part I & II.

o Corrosive Atmosphere: IEC 61701 (for high-corrosion environments).

• Environmental Resilience: Satisfactory operation in humidity up to 100% and

temperatures between $-10^\circ\text{C}$ and $+65^\circ\text{C}$. Modules must

withstand wind gusts up to 200 km/h.

• Performance Warranty:

o $\ge 90\%$ of peak watt capacity at the end of 10 years.

o $\ge 80\%$ of peak watt capacity at the end of 20 years.

• Construction: High transmissivity, low-iron tempered glass front for superior light

transmission and a tough multi-layered polymer backsheet for high-voltage insulation.

1.1 Identification and Traceability (RFID)

Each module must include an RF identification tag (RFID) containing:

1. Manufacturer Name (Module and Cells).

2. Month and Year of Manufacture.

3. Country of Origin.

4. I-V Curve data.

5. Peak Wattage, $I_m$, $V_m$, and Fill Factor (FF).

6. Unique Serial Number and Model Number.

2. Module Mounting Structure (MMS)

• Material: Hot-dip Galvanized MS angles (Minimum size 50mm x 50mm x 6mm).

• Galvanization: Minimum thickness of 120 microns.

• Fasteners: All nuts and bolts must be high-quality Stainless Steel.

• Design Criteria:

o Designed for simple mechanical installation without on-site welding.

o Must withstand wind speeds of 200 km/h.

o Allows for easy replacement of any individual module.

• Foundation: Fixed and grouted in PCC (1:2:4) concrete columns.

• Ground Clearance: Minimum 500 mm from the ground level to the lowest part of the

3. Solar Power Conditioning Unit (PCU / Inverter)

Since this is a battery-less system, the PCU acts as an On-Grid Inverter.

• Function: Converts DC electricity from the array into high-quality AC power.

• Capacity: 25 kW nominal output.

• Protections: Integrated electronic protections against over-voltage, short-circuits, and grid

4. Junction Boxes (DCDB)

• Enclosure: Dust, vermin, and waterproof made of FRP / Thermo Plastic (IP65 for outdoor).

• Components: Copper bus bars of proper sizes, cable glands, and appropriate rating

blocking diodes.

• Function: Facilitates group array isolation and provides test points for quick fault location.

5. AC Distribution Board (ACDB)

• Placement: Located between the PCU and the Load Point.

• Metering: Equipped with an AC Voltmeter and Ammeter.

• Protection: Includes MCBs of suitable ratings for connection to the load and auxiliary

control room loads (fans, lighting).

6. PV Grade Cables and Accessories

• Standard: Conforming to IEC 60189 / IS 694 / IS 1554 (650V / 1.1kV grade).

• Conductor: PVC insulated, PVC sheathed Copper conductor.

• Efficiency: Cable sizing must ensure total electrical energy loss is $< 3\%$.

• Minimum Size: No conductor smaller than 4 sq. mm shall be accepted.

• Management: All wiring must be in a casing-capping system or conduits. Armored cables

are mandatory for underground burial.

7. Earthing and Lightning Protection

o Array structure grounded using GI pipe electrodes (4.5m long, 10mm diameter).

o Masonry enclosures with cast iron covers for earthing pits.

o Array structures and lightning conductors connected via 25mm x 5mm GI strip.

• Lightning Protection: Integrated system to reduce over-voltage to tolerable levels during

atmospheric disturbances.

• Safety: Danger Notice Plates (200mm x 150mm) in English and local language at the PV

Yard and Control Room.

Sr. No Component Specification Summary

1 Solar Array 25000 Wp (Using 330Wp+ Modules)

2 Inverter 25 kW On-Grid PCU (1 Unit)

3 Mounting Hot-dip Galvanized MS (120 Micron)

4 Voltage Grade 1.1 kV (Copper Cables)

5 Grounding GI Pipe Electrodes as per IS:3043

1. Solar PV Modules & Traceability

The system shall utilize high-efficiency crystalline silicon modules. Each module must be designed

to withstand extreme environmental conditions while maintaining peak performance.

1.1. Technical Parameters & Data Sheet

The bidder must furnish the following data for the proposed modules:

Parameter Specification Requirement

Module Make & Country Any MNRE approved / IEC 61215 certified

Module Type Mono / Multi Crystalline Silicon

Peak Power ($P_{max}$) $\ge$ 330 Wp per module

Electrical Efficiency $\ge$ 12%

Frame Material Corrosion-resistant material (Electrolytically compatible)

Junction Box Weather Resistant HDPE (IP55/IP65) with Cable Glands

Parameter Specification Requirement

Operating Temperature -10°C to +65°C

Wind Resistance Up to 200 km/h

Max Temp. Rise Over Max Ambient (to be specified by bidder)

1.2. Identification and RFID Requirements

As per ISO 9000 series, each module must contain an RFID tag embedded inside the laminate with

the following data:

• Name of Manufacturer (Module & Cells).

• Month/Year of Manufacture and Country of origin.

• Unique Serial Number and Model Number.

• I-V Curve for the module.

• Peak Wattage, $I_m$, $V_m$, and Fill Factor (FF).

• IEC Qualification Certificate details and name of the issuing Test Lab.

2. Module Mounting Structure (MMS)

The structure must be robust enough to support the modules for 25 years without site welding.

• Material: Hot-dip Galvanized MS angles (Min 50mm x 50mm x 6mm).

• Galvanization: Minimum 120 microns thickness.

• Foundation: Legs grouted in PCC (1:2:4) concrete columns.

• Ground Clearance: Minimum 500 mm from the lowest part of the module.

• Hardware: All nuts, bolts, and washers must be high-grade Stainless Steel.

• Design: Calculated based on site Latitude/Longitude for maximum energy output.

3. Power Conditioning Unit (PCU) & Distribution

3.1. PCU (Inverter)

• Rating: 25 kW (Battery-less / On-Grid).

• Function: Converts DC to AC and synchronizes with the grid.

• Protection: Built-in protection for over-voltage, short-circuit, and anti-

3.2. AC islanding.

Distribution Board (ACDB)

• Installed between PCU and Load point.

• Includes MCBs of suitable ratings.

• Equipped with AC Voltmeter and Ammeter for output monitoring.

4. Junction Boxes & Cabling

• Junction Boxes: FRP/Thermoplastic construction, dust/waterproof (IP65 outdoor, IP21

indoor). Includes blocking diodes and copper bus bars.

• Cables: 650V/1.1kV grade PVC insulated copper cables (IS 694/1554).

• Energy Loss: Sized to ensure total DC/AC cable loss is < 3%.

• Installation: Casing-capping for internal wiring; armored cables for underground burial.

5. Earthing & Safety Protection

• Earthing: GI pipe electrodes (4.5m long, 10mm dia) as per IS:3043.

• Conductors: 25mm x 5mm GI strips for array structures; tinned copper strips for the

• Lightning Protection: Dedicated system to neutralize atmospheric surges.

• Signage: Red Danger Plates (200mm x 150mm) at the PV yard, Control room, and Battery

6. Commissioning & Logistics

• Scope: Includes supply, installation, testing, and commissioning in the presence of VMC

• Tools & Display: A maintenance tool kit and a 3ft x 3ft Display Board (showing the circuit

diagram) must be provided.

• Insurance: Ex-factory insurance coverage until successful commissioning and acceptance.

• Warranty: Output peak capacity $\ge$ 90% at 10 years and $\ge$ 80% at 20 years.

Executive Summary: 25 kWp On-Grid Solar Power Plant

Component Detailed Specifications

1 Solar PV Modules 25000 Wp (Total Capacity)

(a) Module Make Any MNRE approved or IEC 61215 (Revised) certified

(b) Individual Rating 330 Wp or higher per module (or equivalent)

(c) Quantity Quantity depends on individual module wattage

Custom-designed as per available site footprint (Hot-dip

2 Mounting Structure

25 kW On-Grid Inverter (1 No.); must meet tender

3 PCU (Inverter)

design specifications

PVC Copper cables with surface/recessed casing-capping (As per

site requirement)

Transmission & Transmission, Distribution, and Point Wiring (As per site

Wiring requirement)

1 Set (Includes monitoring, control, and integrated protection

6 Control & Protection

7 Metering 1 No. (AC Side) Generation Meter for performance tracking

8 Spares & Hardware 1 Set (Includes required fuses, screws, terminals, etc.)

Key System Features

• Grid Interaction: This is a battery-less, on-grid system designed to export excess power back

to the grid (if net metering is applied).

• Safety Compliance: Includes standard protection against over-voltage, short-circuits, and

• Durability: Module mounting structure is designed to withstand local environmental loads

and wind speeds up to 200 km/h.

TECHNICAL SPECI. OF HVLS FAN

DESCRIPTION GEARLESS 24 ft HVLS FAN

Model Number 24 PMSM HVLS FAN B6

Diameter 24 FT (7.3M)

Blade 240mm wide Cambred Airfoil

Number of Blades

Noise Level (dBA)

Packed Hub Assy (Kg)

Packed Blades (Kg)

Installed Fan weight (Kg)

CE certification of whole fan assembly YES

PERFORMANCE ( AT MAX SPEED )

Coverage (sq ft)

Maximum Speed (rpm) 0-55 (controllable)

Power Usage (kW) max 1.5Kw

Maximum Effective Diameter (m) Approx. 30m dia.

Frame MS IS2026

Blades Aluminium Alloy 6063 T6

Blade and Hub Connection direct surface single joint connection

SAFETY COMPONENETS

Safety Cables 5 point safety system

Guy Wires 3mm guy wires

Safety Ring & Safety Clips for antifall

MOUNTING HARDWARE

Standard Mount universal

Drop Extensions (option) optional as required

Universal Mount Universal Mount

GEARLESS/PMSM MOTOR

PMSM (Permanent Magnet

Synchronous Motor)

Insulation Class F

Enclosure IP54 Enclosure with PP Powder coating

Start/Stop, Speed control & Reverse

Forward with All Schneider switchgears

Control Option (Not Included)

Standard Power 3phase input

VEICHI VFD with safety features like

Voltage Safety for VFD and Motor over current protection, coated PCB to

protect from dust & moisture.

Motor & Gearbox 5 Years

Blades, Hub & Mounting System 10 Years

ready delivery. Special mounting and

Delivery extension length required 2 week for

Unloading in our scope

Electrical wiring from VFD to Fan in Customer scope

Electrical wiring from Mains to VFD in Customer scope

Scaffollding,Hydra and erection

in Customer scope

Power supply in customer's scope

Transportation in Customer scope

Technical Specification for DIESEL GENERATOR:

1. General System Requirements

• Capacity: 82.5 kVA (Prime Rating).

• Configuration: Silent, water-cooled, turbo-charged (after-cooled for

higher ratings), engine coupled with alternator on a common base

• Duty Cycle: Prime Power (PRP) as per ISO 8528-1.

• Compliance: Must meet CPCB IV+ emission and noise norms (Noise

level < 75dB(A) at 1 meter).

2. Engine Specifications (The "Heart")

• Speed: 1500 RPM.

• Governor: Electronic Governor (Class G3 as per ISO 8528-5) for

precise frequency control.

• Starting System: 12V/24V DC electrical start with battery charging

• Safety Protections: High water temperature (HWT).

o Low lube oil pressure (LLOP).

o Over-speed trip.

o Low fuel level alarm.

3. Alternator Specifications

• Type: Brushless, self-excited, self-regulated (AS440 or equivalent

• Voltage: 415V, 3 Phase, 4 Wire.

• Frequency: 50 Hz.

• Power Factor: 0.8 (lagging).

• Insulation: Class H.

• Enclosure: IP65 minimum protection.

4. Acoustic Enclosure (Silent Canopy)

• Material: 1.6mm to 2mm CRCA (Cold Rolled Close Annealed) steel

• Insulation: High-density rockwool (PU foam is usually rejected for

• Painting: Pure Polyester powder coating (A 7-tank process for

corrosion resistance).

• Environment: Must be weather-proof and suitable for outdoor

installation in Gujarat’s heat.

5. AMF (Auto Mains Failure) Control Panel

• Controller: DeepSea, Woodward, or ComAp (Microprocessor-based).

• Logic: Automatically starts the DG set within 10–20 seconds of a grid

power failure and switches back when power returns.

• Switching: Motorized MCCB or ACB (for higher kVA) with

mechanical and electrical interlocking.

List of Makes: Electrical

1 LT PANELS CPRIAPPROVEDPANELBUILDER.50KA

SHORTCIRCUITWITH STHANDSTRENGTH.

2 DISTRIBUTION BOARDS LEGRAND/ SCHNIEDER / HAGER / ABB

3 MEDIUM VOLTAGE CABLE DIACAB/AVOCAB/POLYCAD /FINOLEX / RRKABLE /

KEI / HAVELLS / GLOSTER/ALLCAB

4 CABLE TRAY ( ALL TYPE ) PROFAB / PRECISION / THINKTRECK

/ UNIVERSAL / INDIANA / KEW

5 LT SWITCHGEAR (ALL RANGE) ASPERSPECIFIEDPANELDISCRIPTIONIN BOQ.

MODEL AS PER SPECIFIED IN BOQ

ABB/SIEMENS/SCHNEIDER/LEGRAND

6 LT MCCB SIEMENS / SCHNEIDER / LEGRAND / ABB

7 LTMCB,ELCB LEGRAND / SCHNEIDER / HAGER /ABB

8 LT SFU SIEMENS / SCHNEIDER / C&S / L&T / ABB /

9 LT CONTACTORS SIEMENS / SCHNEIDER / L&T / ABB / C&S /

INDOASIAN / LEGRAND

10 CHANGE OVER SWITCH HPL / ABB /L&T/ INDOASIAN / C&S

11 METERS (ANALOG) ENERCON / CONZERVE / SCHNEIDER /

SECURE/ABB/MECO/IMP/RISHABH/

AUTOMATICELECTRIC/NIPPEN

12 INDICATING LAMP SIEMENS/SCHNEIDER/L&T/BINAY/ABB

/ KAPPA/ PRECIFINE/ TEKNIC / C&S

13 ELECTRIC TIMER SIEMENS / L&T / LEGRAND/CONSERVE /

14 ROTARY SWITCH SIEMENS/SCHNEIDERELECTRIC/KEYCEE/ SALZER

15 PUSHBUTTONANDPUSHBUTTON SIEMENS / SCHNEIDER ELECTRIC / L & T / BINAY /

SET ABB / MG / BCH / RAAS CONTROL

16 SELECTOR SWITCH KEYCEE / SALZER / L&T

17 ANNUNCIATOR PROTON / EAPL

18 LUGS DOWELL’S / 3D / JAINSON / COMET / HMI

19 BIMETALLIC LUGS ISMAL / HMI

20 CABLE GLAND JAINSON / 3D / COMET / HMI

21 PVC CONDUITS AND ACCESSORIES PRECISION / NIHIR / POLYCAB

22 CASING CAPING PRECISION / NIHIR / POLYCAB / MODI

23 MODULARSWITCHES, SOCKETS & MK-WRAPROUND/LEGRAND-MYRIUS/ HAVELLS –

OTHER ACCESSORIES CRABTREE-ATHENA

24 KEYTAGPANELWITHCONTROL MK/LEGRAND

25 METAL CLAD SOCKET WITH MCB MDS / SIEMENS

26 PVC TAPE STEEL GRIP

27 PVC JUNCTION BOX SINTEX /CLIPSAL/NIHIR/PRECISION

28 WIRES FOR INTERNAL WIRING FINOLEX / RRKABLE / HAVELLS / POLYCAB /

29 COAXIAL TV CABLE DELTON / NATIONAL / HAVELLS / RR KABLE

30 CONNECTORS (COLOURS AS PER SALZER / ELEMEX / WAGO /

PHASE & NEUTRAL) CONNECTWELL/PHOENIX

31 LIGHT FIXTURES PHILIPS, CROMPTON, LT, HELONIX

32 CEILING FAN , EXHAUST FAN, HVLS CROMPTON, HAVELS,ORIENT, AUSTER, D&D,

FAN GOLDEN ENG.

33 LIGHTING PROTECTION MAP WORLD WIDE/

STERLING/INDELEC/EMTERPRISE/OBO/EQUIVALEN

34 ROOF TOP SOLAR POWER PLANT THORUGH GEDA’S EMPANELLED AGENCY ONLY

35 MOTOR PUMP SET KIRLOSKER/ CROMPTON/LUBI

36 MOTOR STARTER L&T, SIEMENS, GALCO,ALLICO

37 CABLE FINOLEX/INCAB/AVOCAB/KEI/POLYCAB/RR CABLE

38 Diesel Generator CUMMINS/TATA/MAHINDRA/SUDHIR

POWER/KOHLER/KOEL GREENS

List of Makes: Solar System

1 PCU / Inverter SMA, ABB India, Hitachi Hi-Rel, Delta Electronics, Schneider Electric,

Sungrow, Solaredge, Solis, Growatt

2 PV Modules Vendors listed in the Latest ALMM Order (Approved List of

Models and Manufacturers)

3 LT Switchgear & Enclosures L&T, Siemens, ABB, Schneider Electric, Hensel Electric, Urja

Techniques, Jayesh Electricals, Havells, C&S (Panel must be

4 Solar DC Cable LAPP, Siechem, KEI Cables, UniFlex, Cords Cables, Apar,

Universal, KEC, Leoni, Suyog Electricals, Polycab

5 AC Cable LAPP, KEI, Havells, Universal, KEC, GEMSCAB, Suyog

Electricals, Apar, Siechem, RR Cable, Polycab

6 Steel Structure (MMS) ESSAR, TISCO, SAIL, JINDAL

7 Earthing Pit Materials Ashlok, ERICO

8 String Junction Box (SJB) Hensel Electric, Trinity Solar, Eaton, Photon

9 Lugs Dowell, Comet, 3D, HEX

10 Cable Glands Comet, 3D

11 Optical Fiber Cable Polycab, RR Cable

12 Lightning Arrestor (ESE) Erico, Nimbus, AT (Spain), Ingesco, Indelec, Ashlok

13 Bi-Directional Meter SEMS, EDMI, or any DISCOM Approved Make

14 MCCB Siemens, ABB, Schneider, L&T

Compliance Notes:

• ALMM Compliance: For Solar PV modules, the bidder must ensure the specific model is listed

in the current ALMM (Approved List of Models and Manufacturers) as issued by MNRE.

• Grid Synchronization: The Bi-Directional/Net Meter must strictly follow the local DISCOM

(Electricity Board) specifications to ensure successful grid integration.

• Switchgear Safety: All LT panels must be sourced from CPRI (Central Power Research

Institute) approved vendors to guarantee short-circuit and temperature-rise compliance.

GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS

Signature of Contractor Signature of Deputy Executive Engineer

Signature of Executive Engineer

Signature of Superintending Engineer